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US secretary of state John Kerry warns Egyptian authorities to respect the right to peaceful protest

US secretary of state John Kerry warns Egyptian authorities to respect the right to peaceful protestProtesters gather outside an impromptu hospital for victims of the shootingSupporters and opponents of Mr Mursi clash in CairoSupporters of Mohammed Mursi clash with riot police in Cairo

The United States has urged Egypt to respect the right to peaceful protest, and warned that Egypt was at a "pivotal moment".

Muslim Brotherhood spokesman Ahmed Aref said 66 people had been killed and another 61 were "brain dead" on life support machines.

More than 4,000 people were treated for the effects of teargas and gunshot or birdshot wounds.